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10-16-2006, 06:20 PM | #1 |
Scooby Newbie
Member#: 107189
Join Date: Feb 2006
Chapter/Region:
Tri-State
Location: North Jersey, Morris County
Vehicle:2006 Subaru STI WRB eBay: rainbowarior |
true or false about catalytic converters
true or false
They make your car sound quieter. Is is true that your car will sound even louder without catalytic converters? How much louder if so? |
10-16-2006, 06:34 PM | #2 |
Scooby Guru
Member#: 103068
Join Date: Dec 2005
Chapter/Region:
SCIC
Location: PM me if I don't answer posts
Vehicle:11 STI sedan SWP |
True. The cat will muffle the sound of your engine just like a resonator. How much louder depends on the size, material and shape of piping in the rest of your exhaust system.
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10-16-2006, 06:38 PM | #3 |
Scooby Newbie
Member#: 73951
Join Date: Nov 2004
Chapter/Region:
South East
Location: Aberdeen, NC
Vehicle:2006 M5 Blue |
On my Evo, I have a resonated test pipe that is quieter then my high flow cat with metal substrate. I was amazed that it would be like that...
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10-16-2006, 06:58 PM | #4 |
Scooby Newbie
Member#: 78069
Join Date: Dec 2004
Location: Concord Township, OH
Vehicle:2008 Mitsu Lancer Apex Silver |
Stock cat does keep your car quieter, yes. HFCs are more of a crapshoot depending on design.
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10-16-2006, 07:25 PM | #5 |
Scooby Specialist
Member#: 121031
Join Date: Jul 2006
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They're supposed to, but I replaced both my cats with a bellmouth downpipe and barely gained any volume at all. It's BARELY louder than stock and that's at idle.
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10-16-2006, 07:51 PM | #6 |
Scooby Guru
Member#: 94070
Join Date: Aug 2005
Chapter/Region:
South East
Location: Dirty South
Vehicle:05 LGT PSM |
They make your car quieter but it is not their only purpose.
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10-16-2006, 07:59 PM | #7 |
Scooby Specialist
Member#: 97043
Join Date: Sep 2005
Chapter/Region:
TXIC
Location: Tomball Tejas
Vehicle:08 STI 02 Z28 - project |
exhaust flow restriction typically results in muffling.
obviously not the case with "mufflers" designed to get noticed. Design plays a large role in amount of muffling. Think of a paper towel role as an exhaust and you talking through it as the engine noise, more restriction=less noise. However design plays a role like cheerleader megaphone cones, or kazoos, or ... you get the point. |
10-16-2006, 08:07 PM | #8 |
Big Ron
Super Moderator Member#: 18062
Join Date: Apr 2002
Chapter/Region:
MAIC
Location: I can save you a ton of cash
Vehicle:on car parts so PM me b4 j00 buy |
They say they will make them quieter, but my dB testing does not bear this theory out.
Facts>Fiction |
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